Single Player Chapter 10 bug/glitch: makes game UNPLAYABLE

I've been experiencing a pretty serious bug during my playthrough of UC3 on Normal mode.

At the start of Chapter 10, I watch the cutscene and proceed to walk down the narrow street behind Elaine and Sully. From an online walkthrough I can tell that they are supposed to be talking for a while, arrive at a gate, and open it to let me in. However, none of this happens. Their dialogue does not trigger, and when they get to the gate, they simply turn around and stand at either side, doing nothing. After walking towards them, at a certain posistion my character freezes in place and I cannot move anything except the camera.

I quit the game and tried to restart the chapter, but then I encountered the 'spinning ring' glitch, where the load ring spins and spins and spins long after the music starts. It won't let me back in unless I start from chapter 9 and play through, but even then, every time I play through the same thing happens.

I made 3 new save games and played through from chapters 1 to 10, and still, I get the same problem.